Figure F4. Pyroclastic and epiclastic volcanogenic layers. The lower layer (58-62.5 cm) is mostly composed of volcanic glass suggesting it is a volcanic ash, whereas the overlying layer is rich also in glass, but contains a considerable amount of ferromagnesian minerals. The contact between the two layers is sharp to diffuse. Unit II (interval 180-1115B-10H-4, 48-66 cm).